MANUFACTURING PROCESS OF PURIFIED LACTIC ACID
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United States of America Patent
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Issued Date -
Feb 28, 2013
app pub date -
Aug 23, 2012
filing date -
Aug 24, 2011
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Abandoned
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Abstract
A manufacturing process of purified lactic acid includes a fermentation process where a pH adjusting agent containing calcium and a microorganism are added to a sugar-containing solution to produce lactic acid in the form of calcium lactate, and a purification process where sulfuric acid is added to a solution containing calcium lactate to separate calcium ions in the form of calcium sulfate. Prior to the step of adding sulfuric acid, a reverse osmosis membrane concentration step removes water; a crystallization step crystallizes and removes calcium lactate; and a reverse osmosis membrane concentration step where the solution from which calcium lactate has been removed is heated and allowed to pass through the reverse osmosis membrane removes water, the crystallization step and the subsequent reverse osmosis membrane concentration step being repeated one or more times.
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